Connections of LM16202 LCD display with Atmega32 microcontroller

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// Program to display a single alphabet ‘A’ on LCD 
/*
LCD data transfer through 8 bit mode
Writing a single letter A on LCD
 
LCD DATA port----PORT A
ctrl port------PORT B
rs-------PB0
rw-------PB1
en-------PB2
*/
 
#include<avr/io.h>
#include<util/delay.h>
#ifndef F_CPU
#define F_CPU 16000000UL
#endif
 
#define LCD_DATA PORTA // LCD data port
#define ctrl PORTB
#define en PB2 // enable signal
#define rw PB1 // read/write signal
#define rs PB0 // register select signal
 
void LCD_cmd(unsigned char cmd);
void init_LCD(void);
void LCD_write(unsigned char data);
 
 
int main()
{
DDRA=0xff; // making LCD_DATA port as output port
DDRB=0x07; // making signal as out put
init_LCD(); // initialization of LCD
_delay_ms(50); // delay of 50 milli seconds
//LCD_write('B'); // call a function to write A on LCD
LCD_string();
return 0;
}
 
void init_LCD(void)
{
LCD_cmd(0x38); // initialization of 16X2 LCD in 8bit mode
_delay_ms(1);
 
LCD_cmd(0x01); // clear LCD
_delay_ms(1);
 
LCD_cmd(0x0E); // cursor ON
_delay_ms(1);
 
LCD_cmd(0x80); // ---8 go to first line and --0 is for 0th position
_delay_ms(1);
return;
}
 
void LCD_cmd(unsigned char cmd)
{
LCD_DATA=cmd;
ctrl =(0<<rs)|(0<<rw)|(1<<en); // RS and RW as LOW and EN as HIGH
_delay_ms(1);
ctrl =(0<<rs)|(0<<rw)|(0<<en); // RS, RW , LOW and EN as LOW
_delay_ms(50);
return;
}
 
void LCD_write(unsigned char data)
{
LCD_DATA= data;
ctrl = (1<<rs)|(0<<rw)|(1<<en); // RW as LOW and RS, EN as HIGH
_delay_ms(1);
ctrl = (1<<rs)|(0<<rw)|(0<<en); // EN and RW as LOW and RS HIGH
_delay_ms(50); // delay to get things executed
return ;
}
 
void LCD_string(void)
{
unsigned char str[] = "Hi This is Biswajit Manna";
int i;
for(i=0;i<16; i++)
{
LCD_DATA = str[i];
ctrl = (1<<rs)|(0<<rw)|(1<<en); // RW as LOW and RS, EN as HIGH
_delay_ms(1);
ctrl = (1<<rs)|(0<<rw)|(0<<en); // EN and RW as LOW and RS HIGH
_delay_ms(50); // delay to get things executed
}
if (i==16)
{
 
LCD_cmd(0xC0); // ---C go to 2nd line and --0 is for 0th position
_delay_ms(1);
for (i=16;i<sizeof str;i++)
{
LCD_DATA = str[i];
ctrl = (1<<rs)|(0<<rw)|(1<<en); // RW as LOW and RS, EN as HIGH
_delay_ms(1);
ctrl = (1<<rs)|(0<<rw)|(0<<en); // EN and RW as LOW and RS HIGH
_delay_ms(50); // delay to get things executed
}
}
return;
}